The new timeline editor is a wonderful addition which adds the required (something I probably cannot do without) convenience for creating more complex interactions in a more compact manner by eliminating the need to do transforms with the event sheet in place of keyframing with object movement within the editor.
Master key frames is an interesting concept that I've never seen in all the previous timelines I've worked with. Visualizing all your key frame placements within one single line is quite convenient.
The obsessive list of easing options is one of the best parts of this editor, because combining them within context of how fast you animate them yields numerous results within a single easing type itself.
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With it being an experimental option, it already does production level things. However; when you have a dialog focused above an opened timeline editor, pressing the spacebar while typing text will play the timeline and will eventually crash Construct 3 when you commit to completion of the dialog, namely the `add built-in function` one because that's where I found out that it did such a thing.